Float:
<!-- BEGIN NV Chatbot Floating -->
<style>
  #nv-fab{position:fixed;right:18px;bottom:18px;z-index:9999;border:0;border-radius:9999px;padding:14px 16px;background:#0ea5e9;color:#fff;font-weight:700;cursor:pointer;box-shadow:0 8px 24px rgba(0,0,0,.12)}
  #nv-pane{position:fixed;right:18px;bottom:78px;width:360px;max-width:95vw;height:560px;max-height:80vh;border:0;border-radius:12px;box-shadow:0 16px 48px rgba(0,0,0,.14);display:none;z-index:9998;overflow:hidden;background:#fff}
  @media (max-width:600px){#nv-pane{width:95vw;height:75vh}}
</style>
<button id="nv-fab">Chat</button>
<iframe id="nv-pane" allow="microphone"
        src="https://assets.neurovoice.de/widget-allinone.html?api=https://api.neurovoice.de&primer_id=company-specific&license=NVK-PREM-3333&v=47"></iframe>
<script>
  const fab=document.getElementById('nv-fab'), pane=document.getElementById('nv-pane');
  fab.onclick=()=>{ pane.style.display = pane.style.display==='none'?'block':'none'; };
</script>
<!-- END NV Chatbot Floating -->